Author's Notes:

This chapter contains a bath scene.

Sunset Shimmer stood on all fours with her eyes closed and letting out moans of pleasure (as well as a few farts) as Flash Sentry rubbed her butt. He loved the way her butt felt, and she loved the butt massage he was giving her.

FFFFFRRRRRRT!

Sunset giggled while Flash inhaled deeply.

"Hey, have you ever thought about being a smelly girl?" Flash asked her. "Like, smelling as bad as your farts from time to time?"

"No, not particularly."

"I dare you to go a week without washing. Or changing out of your pajamas."

"I'm not sure. People will think I'm weird if I'm wearing my pajamas everywhere, let alone smelly pajamas."

Flash slapped Sunset's butt playfully. "If Rainbow Dash and Lightning Dust can smell twice as bad as I'm asking you to smell, and they can fart in front of whoever they want, and Adagio can walk around in pee-soaked pants all the time, what's a really cute pair of pajamas compared to that?"

Sunset giggled. "You've got a point there. All right. I'll do it." She actually was a little excited for this. "Wait, I don't have to wet myself or not use toilet paper, do I?"

"Up to you. You can remove your pants and underwear to go to the bathroom. Just don't change into anything else, and don't shower. But you can wash your hands, and use dry shampoo on your hair."

...

The following day, on July 8th, the girls, including Wallflower, the sirens, Indigo, and Lightning Dust, were having a picnic at Sweet Apple Acres.

"Sunset, darling, why are you still wearing your pajamas?" said Rarity.

"Because Flash dared me to not change out of them or wash for a week," Sunset replied.

"Oh. That'll be... interesting. Most of us have already had our turn. And you probably won't smell as bad as your farts. Or Rainbow Dash."

Sunset was glad Rarity wasn't disgusted. Or if she was, she wasn't showing it. She reminded herself that this girl loved to wet the bed.

"Ooh!" said Pinkie Pie. "I'd like to try it too! I won't change out of this outfit or wash for as long as you do, Sunny!"

"Just make sure you wash your hands and hair," said Sunset.

"Of course I was still gonna do that, silly!" Pinkie suddenly crossed her legs and started fidgeting in her chair. "I gotta go pee! Real bad!"

"You didn't have a whole lot to drink," said Applejack.

"I did this morning, and I haven't gone to the bathroom all day!" She fidgeted harder, sweating slightly as she tried to hold it in.

Rainbow Dash gave her a mischievous grin. Pinkie smiled back slightly. Rainbow lifted her leg and let out a loud fart.

PPPPPFFFFRRRRRRT!

Pinkie laughed hard, and at almost the same time, she started to pee in her jean shorts.

Sunset was feeling gassy this morning. She thought it couldn't hurt to make Pinkie laugh more now that the damage was already done. So, she let out an equally loud but deeper-pitched fart.

BBBBBRRRRRRRRRT!

As Pinkie's laughing got harder, so did her stream, and pee flowed off the edge of the seat she was sitting in and onto the grass below. The other girls laughed or chuckled slightly. Even Rarity, she still acted disgusted at Rainbow and Sunset's farts but she was used to how her friends were.

"Sorry Pinkie," said Sunset once Pinkie finished laughing and peeing.

"It's all right," said Pinkie cheerfully. "Besides, Dashie farted first. And I don't mind that either."

"If you want, you could take a shower and then start your... smelly girl adventure," said Rarity.

"No thanks! I'll stay in these shorts for a week!" Pinkie giggled excitedly.

...

By the next day, Sunset was starting to smell slightly. It was a hot day out so she knew she'd be sweating.

She was sitting on her couch farting when her cell phone rang, and she answered it.

"Hello?"

"Hi Sunset!" came Rainbow Dash's voice. "How would you like to enter the race with me today?"

"Sure." She knew it would make her sweat a lot, especially since she didn't often run races. She let out another loud fart and listened to Rainbow's laughter before she hung up.

...

Sunset stood at the racetrack with Rainbow Dash, Indigo Zap, Lightning Dust, and Applejack. They all smelled worse than her, but they were all wearing shorts and either a T-shirt or tank top. She was sweating a little more in her pajamas, so she took a big drink from her water bottle before the race.

The race began. Sunset was near the middle of the pack, running as fast as she could.

She was still running when the announcer said "Rainbow Dash wins by a nose! Second place, Lightning Dust, and third, Indigo Zap!"

Sunset knew she didn't have a chance against them, but she didn't mind. Running the race was kind of fun.

By the time she reached the finish line and sat down, she was dripping with sweat, to the point that her hair and pajamas were soaking wet.

"Here," said Rainbow Dash, offering Sunset a bottle of water.

"Thanks," said Sunset, out of breath, and she downed the water in one gulp.

As she made her way home with Applejack at her side (Rainbow Dash, Indigo Zap, and Lightning Dust going to Rainbow Dash's house to have a farting contest), the summer heat dried most of the sweat off Sunset, though of course she still started to sweat again once the coolness of the evaporation had gone away. She sniffed her armpit, picking up an odor slightly more pungent than earlier this morning. She sniffed Applejack. Applejack still smelled worse than her, though she didn't mind because her farts were even stinkier.

...

Soon, it was Thursday, July 14th, a week into Sunset's dare. The girls, sans the sirens, Lightning Dust, and Indigo Zap, sat at the table of Pinkie's house for a breakfast she was treating them to. She made sure none of her sweat, grime, or pee got into the recipe.

By now, Sunset smelled nearly as bad as Applejack. Applejack only smelled worse because her shorts and legs had a pee smell on them from wetting herself while working at the farm, even though it often dried quickly in the heat. Sunset had competed in a few more races and sweated a lot more.

Pinkie Pie smelled just as bad as Applejack because she had been wetting herself from laughing at Sunset, Rainbow Dash, Lightning Dust, Sonata Dusk, and Aria Blaze farting in front of her. She had not gone a day without a pee accident in a long time, but she didn't mind. If anything she liked it, and thought it made her funnier.

"Who wants to sniff Sunset and Pinkie?" said Rainbow Dash. "I'd do it, but I probably wouldn't notice their smell compared to my own."

"I'll do it," said Twilight. She sniffed Sunset. "Phew, you do smell bad."

Sunset blushed lightly and chuckled.

"Oh! Sniff me, sniff me!" said Pinkie excitedly.

Twilight sniffed Pinkie. "You smell like a week's worth of sweat mixed with urine."

Pinkie giggled. Her shorts were still damp from her last accident, but were drying nicely - until Rainbow Dash farted again.

...

That night, Sunset had dinner at Flash's house.

"So," said Flash, "last day of your dare. How do you like being a smelly girl?"

Sunset sniffed her armpit. She still didn't smell as bad as her farts, but she was getting close. "I like it more than I thought I would. I wouldn't mind going another week without washing."

"Neither would I." Flash sniffed her armpit and sighed in satisfaction.

"A week from today, I would like to wash up. And, if you don't mind, there's a certain way I'd prefer to do that."

Once they were done eating, she got on all fours so he could give her the butt massage they both enjoyed so much.

"Phew," said Flash, slapping Sunset's butt lightly before continuing to rub it. "Did you fart?"

"No," said Sunset. "I'm not gassy right now."

"Well your butt sure smells like it." He sniffed her butt deeply as he continued to massage it. Perhaps it was a combination of not washing and how often she farted that made her rear end smell this bad.

Sunset giggled. She had taken her shoes and socks off after arriving at Flash's house, so he stopped rubbing her butt to sniff her feet. They smelled as bad as her behind, but his sigh told her that he liked the way they smelled. Then he resumed rubbing her tush.

"Hey Flash," said Sunset.

"Yes?"

Sunset started to pee. "Ahhhhhhh..."

...

At the same time, Pinkie Pie sat at her table, eating a giant cake she had baked moments ago, and getting bits of frosting on herself.

She let out a loud fart and giggled, until her next wet fart told her she needed to do more. She rushed to the bathroom and sat on the toilet, whose lid was up since she had cleaned it earlier today. She noticed that the toilet's water was yellow; she had forgotten to flush the last time she had used the toilet. She was about to pull her shorts down, when she felt another fart coming.

She knew a fart when she had one inside her, and she could still make a loud and wet noise with this one while keeping her shorts from getting dirtier than they currently were.

So, she lifted both her legs to fart... and her butt splashed into the water of the toilet. Pinkie let out a squeal of surprise, and farted harder than she had intended. The sound could still be heard, but it was deeper and wetter. The water in the toilet bubbled, but the bubbles stopped before the flatulent noise did, and suddenly Pinkie's shorts and underwear felt dirtier than before.

"Oopsie!" Pinkie giggled, and tried to pull herself out of the toilet.

After a bit of grunting, she stopped. She probably could have gotten out if she tried hard enough, but she wanted to get back to eating cake right away, and thought it might take longer to get out on her own. So she picked up her cell phone, and called Applejack.

"Hi Applejack. Can you come over and help me? I fell into the toilet and I'm having a hard time getting out. The door's open. And, in advance, sorry about the mess. I MIGHT smell a bit worse than this morning." She giggled, before letting out another sloppy wet fart.

...

A week later, it was July 21st. Sunset was sitting on a couch with Flash, smelling as bad as Rainbow Dash. Rainbow Dash's rinsing only kept her smell from becoming as bad as Indigo's, so she normally would have smelled worse. But, Rainbow Dash didn't have a pee smell, where Sunset had wet her pajamas for Flash every night they spent together.

Flash sniffed Sunset's armpits. "Phew, you smell awful!" He punched her arm playfully, and she giggled. Then he sniffed her feet, and gave her her butt massage. This time she was gassy, so she farted in his face several times.

"Which smells worse - me or my farts?" said Sunset after a particularly loud and wet fart.

"Hard to say." Flash sniffed Sunset's butt. "So... Your two weeks are up."

"Such a shame," said Sunset. She started peeing. "Maybe I should do this again once and a while. I don't want to be a smelly girl ALL the time."

"How about I give you a bath?"

"No." Sunset farted again.

"You really need one."

"I can do it myself in the shower." Sunset finished peeing.

"Looks like we'll have to do this the hard way." Flash picked up Sunset, with one hand on her back and the other on her back legs.

"Let me go!" said Sunset, squirming in Flash's arms as he carried her outside. "I don't want a bath!"

"You need one desperately," said Flash. He could smell Sunset very clearly.

He carried the squirming, wet, smelly girl to the backyard, where a wooden tub sat, full of warm, soapy water. Flash had bought it from Applejack and filled it specifically to bathe Sunset.

Flash tossed Sunset butt-first into the tub with a splash.

"Flash, you got my pajamas all wet," said Sunset.

"They were wet already," said Flash. "And they really need to be washed." He took a bath scrubber, sumberged Sunset's top half under the water, and started to scrub her.

Sunset fidgeted and groaned while Flash lathered her hair in shampoo. As he tried to scrub her armpits, she splashed around in the tub, soaking Flash from head to foot.

"All right, that's it," said Flash. "If you're not going to be a good girl and let me give you a bath without any trouble, you deserve a spanking."

Flash pulled up a folding chair, lifted the soaking wet Sunset out of the tub, put her over his lap, still catching a whiff of an unpleasant odor from her, and then he raised his hand and slapped her butt.

He spanked her twenty times. When he stopped, he was about to pick her up when she gave him a pleading look. So Flash spanked her five more times and then threw her back into the tub.

Sunset rubbed her butt, but the warm water made it feel better soon. Flash resumed scrubbing Sunset's armpits, creating suds all over her smelly pajamas while she sat still.

As Flash started to scrub Sunset's other arm, bubbles appeared in the water around her, and both she and Flash chuckled.

Once her armpits, sides, arms, and back were washed, Flash put Sunset in a position where she was leaning over the side of the sub and started to scrub her butt vigorously with the scrubber, covering it in suds.

Sunset couldn't help but sigh, for this was like another butt massage and it felt good after her spanking. She wondered whether those last five swats were really necessary.

After a minute of scrubbing, Sunset let out a boisterous wet fart. Both she and Flash chuckled, and Flash started scrubbing harder.

After scrubbing Sunset's rear for five minutes straight, Flash set her back into a sitting position and lifted her feet above the water. He took a whiff of her stinky feet and started to wash them, getting between the toes. Sunset farted in the tub a few more times.

Once he was done, he poured a bucket of warm water over her to rinse the suds off, and let her stand up and step out of the tub, clean and smelling only of soap. "There, all done."

"That was fun," said Sunset. "Way more exciting than last time. You did every part just the way I wanted." Last week she had told Flash that she wanted to simulate being forced to take a bath. "I'm sorry about splashing you. Was that too much?"

"Not at all. I don't mind. I'm more worried that I spanked you too hard."

"No, it was perfect." Sunset sighed in satisfaction. "My butt still hurts a little," she admitted, rubbing her behind, "but that was my fault for asking for more swats. But nothing a nice butt massage can't fix." She slapped her butt playfully, wincing a little at a slight pain.

"Oooh!" said Pinkie Pie, looking in from over the fence. "Looks like fun!"

"Hi Pinkie," said Sunset. "Care to join us?"

Pinkie walked over to them. Sunset walked over to her and sniffed her. "Phew, you smell worse than I did."

"Thanks!" Pinkie giggled. "I may have done part of that accidentally." She turned around for a few seconds so that Sunset and Flash could see a brown stain on the butt of her jean shorts, although there was no bulge. "But, being a smelly girl's pretty fun. Although, I think it's about time to stop. Ooh! I gotta go potty! Sunset, can you fart before I wash up?"

Sunset smirked slightly and released a long, explosive fart, followed by a shorter, higher-pitched fart.

BBBBBBBRRRRRRRRRAAAAAAAAAAAP! PFFFFT!

Pinkie Pie laughed, and her damp shorts quickly grew warm and wet.

"Flash, are you thinking what I'm thinking?" said Sunset.

"Why not?" said Flash.

As soon as Pinkie was done peeing, Sunset and Flash picked her up and threw her in the tub. Pinkie giggled as Sunset and Flash each started to scrub one of her smelly armpits.